Method for preparing microbial flocculant form potato starch wastewater as raw material

Abstract

The invention relates to a method for preparing a microbial flocculant form potato starch wastewater as a raw material. The method comprises the following steps of: (1) screening a microbial flocculant strain Candida anglica; (2) preparing primary seed solution of the strain Candida anglica; (3) preparing a fermentation medium; (4) preparing fermentation liquor with flocculation activity; and (5) purifying, extracting, freezing and drying the fermentation liquor with flocculation activity to obtain a crude extract of the flocculant. The method is simple in process, short in fermentation period and easy to implement, has remarkable environmental and economic benefits, and is suitable for industrial production and popularization.

Description

technical field

[0001] The invention relates to a method for preparing a microbial flocculant, in particular to a method for preparing a microbial flocculant by using potato starch wastewater as a raw material. Background technique

[0002] my country is a large potato producing country, and its planting area is the second in the world. It is the main processing raw material of industrial starch together with wheat and corn. In recent years, with the rapid development of the starch processing industry, my country processes about 3 million tons of potatoes annually and produces about 8 million tons of wastewater. Potato starch wastewater is a high-concentration organic wastewater, containing various sugars, various amino acids, fats, organic acids, vitamins and enzymes, etc., with high chemical oxygen demand (COD), about 8000~40000 mg / L, biochemical It has good properties and has the potential to be used as a fermentation medium. If it is discharged directly, it will cause ...

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